Step-by-step explanation:
Let a, b, c be the measures of the interior angles and x, y, z be the measures of the exterior angles of the triangle. Where x and adjacent to a, y is adjacent to b and z is adjacent to c.
By interior angle sum postulate of a triangle:
a + b + c = 180°... (1)
Therefore, by remote interior angle theorem:
x = b + c.... (2)
y = a + c..... (3)
z = a + b.... (4)
Adding equations (2), (3) & (4)
x + y + z = b + c + a + c + a + b
x + y + z = 2a + 2b + 2c
x + y + z = 2(a + b + c)... (5)
From equations (1) & (5)

Thus, the sum of exterior angles so formed is equal to four right angles.
Proved.
120 inches cubed (^3)
To find the volume of a rectangular prism, the formula is base area • height. We just have to solve this problem.
The two sides of the base 8 and 5. 8 • 5 = 40, so the area of the base = 40.
Then, the height is 3. 40 • 3 = 120, so the volume is 120 inches^3
Answer:
The answer is B I think
Step-by-step explanation:
Hopes this helps and sorry if i get this wrong and please give me brainlest.